EDITORS' NOTE: Reuters and other foreign media are subject to Iranian restrictions on their ability to film or take pictures in Tehran. Iran's President Mahmoud Ahmadinejad (C) walks with First Vice President Mohammad Reza Rahimi (3rd R) and Ali Akbar Velayati, Supreme Leader Senior advisor in International affairs (2nd L) before leaving Tehran's Mehrabad airport to attend the 66th General Assembly of the United Nations in New York September 19, 2011. REUTERS/Morteza Nikoubazl (IRAN)